离心模型试验边界效应分析

通过对模型土进行加卸载的离心模型试验，分析边界摩擦力对土体变形的影响。由试验可以得到土层表面的弹性变形曲线，根据模型土体的位移边界条件，假设土层的位移函数，运用最小势能原理，求出边界磨擦力的大小，以及离心机加载过程中，在惯性力场和边界摩擦力作用下，模型土体的位移计算公式。通过试验和计算认为，在离心模型试验中，边界摩擦力对粘性土体的位移场有很大影响，应采取一定的措施减小摩擦力。

Boundary Effect Analysis of Centrifuge Test

By the loading and unloading test of model soil in centrifuge test, the influence of boundary friction force for soil deformation was analyzed. From the loading and unloading test, the elastic curve of soil surface was obtained. Depending on the boundary displacement conditions of model soil, the soil displacement function was supposed, and with the principle of minimum potential energy, the boundary friction force and model soil displacement formula were analyzed. From the test and analysis, it concludes that the boundary friction force has great influence to clay soil displacement and some measures should be taken to reduce friction force during centrifuge test.